arch/x86/include/asm/sigcontext.h

   1 #ifndef _ASM_X86_SIGCONTEXT_H
   2 #define _ASM_X86_SIGCONTEXT_H
   3
   4 #include <linux/compiler.h>
   5 #include <linux/types.h>
   6
   7 #define FP_XSTATE_MAGIC1        0x46505853U
   8 #define FP_XSTATE_MAGIC2        0x46505845U
   9 #define FP_XSTATE_MAGIC2_SIZE   sizeof(FP_XSTATE_MAGIC2)
  10
  11 /*
  12  * bytes 464..511 in the current 512byte layout of fxsave/fxrstor frame
  13  * are reserved for SW usage. On cpu's supporting xsave/xrstor, these bytes
  14  * are used to extended the fpstate pointer in the sigcontext, which now
  15  * includes the extended state information along with fpstate information.
  16  *
  17  * Presence of FP_XSTATE_MAGIC1 at the beginning of this SW reserved
  18  * area and FP_XSTATE_MAGIC2 at the end of memory layout
  19  * (extended_size - FP_XSTATE_MAGIC2_SIZE) indicates the presence of the
  20  * extended state information in the memory layout pointed by the fpstate
  21  * pointer in sigcontext.
  22  */
  23 struct _fpx_sw_bytes {
  24         __u32 magic1;           /* FP_XSTATE_MAGIC1 */
  25         __u32 extended_size;    /* total size of the layout referred by
  26                                  * fpstate pointer in the sigcontext.
  27                                  */
  28         __u64 xstate_bv;
  29                                 /* feature bit mask (including fp/sse/extended
  30                                  * state) that is present in the memory
  31                                  * layout.
  32                                  */
  33         __u32 xstate_size;      /* actual xsave state size, based on the
  34                                  * features saved in the layout.
  35                                  * 'extended_size' will be greater than
  36                                  * 'xstate_size'.
  37                                  */
  38         __u32 padding[7];       /*  for future use. */
  39 };
  40
  41 #ifdef __i386__
  42 /*
  43  * As documented in the iBCS2 standard..
  44  *
  45  * The first part of "struct _fpstate" is just the normal i387
  46  * hardware setup, the extra "status" word is used to save the
  47  * coprocessor status word before entering the handler.
  48  *
  49  * Pentium III FXSR, SSE support
  50  *      Gareth Hughes <gareth@valinux.com>, May 2000
  51  *
  52  * The FPU state data structure has had to grow to accommodate the
  53  * extended FPU state required by the Streaming SIMD Extensions.
  54  * There is no documented standard to accomplish this at the moment.
  55  */
  56 struct _fpreg {
  57         unsigned short significand[4];
  58         unsigned short exponent;
  59 };
  60
  61 struct _fpxreg {
  62         unsigned short significand[4];
  63         unsigned short exponent;
  64         unsigned short padding[3];
  65 };
  66
  67 struct _xmmreg {
  68         unsigned long element[4];
  69 };
  70
  71 struct _fpstate {
  72         /* Regular FPU environment */
  73         unsigned long   cw;
  74         unsigned long   sw;
  75         unsigned long   tag;
  76         unsigned long   ipoff;
  77         unsigned long   cssel;
  78         unsigned long   dataoff;
  79         unsigned long   datasel;
  80         struct _fpreg   _st[8];
  81         unsigned short  status;
  82         unsigned short  magic;          /* 0xffff = regular FPU data only */
  83
  84         /* FXSR FPU environment */
  85         unsigned long   _fxsr_env[6];   /* FXSR FPU env is ignored */
  86         unsigned long   mxcsr;
  87         unsigned long   reserved;
  88         struct _fpxreg  _fxsr_st[8];    /* FXSR FPU reg data is ignored */
  89         struct _xmmreg  _xmm[8];
  90         unsigned long   padding1[44];
  91
  92         union {
  93                 unsigned long   padding2[12];
  94                 struct _fpx_sw_bytes sw_reserved; /* represents the extended
  95                                                    * state info */
  96         };
  97 };
  98
  99 #define X86_FXSR_MAGIC          0x0000
 100
 101 #ifdef __KERNEL__
 102 struct sigcontext {
 103         unsigned short gs, __gsh;
 104         unsigned short fs, __fsh;
 105         unsigned short es, __esh;
 106         unsigned short ds, __dsh;
 107         unsigned long di;
 108         unsigned long si;
 109         unsigned long bp;
 110         unsigned long sp;
 111         unsigned long bx;
 112         unsigned long dx;
 113         unsigned long cx;
 114         unsigned long ax;
 115         unsigned long trapno;
 116         unsigned long err;
 117         unsigned long ip;
 118         unsigned short cs, __csh;
 119         unsigned long flags;
 120         unsigned long sp_at_signal;
 121         unsigned short ss, __ssh;
 122
 123         /*
 124          * fpstate is really (struct _fpstate *) or (struct _xstate *)
 125          * depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
 126          * bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
 127          * of extended memory layout. See comments at the definition of
 128          * (struct _fpx_sw_bytes)
 129          */
 130         void __user *fpstate;           /* zero when no FPU/extended context */
 131         unsigned long oldmask;
 132         unsigned long cr2;
 133 };
 134 #else /* __KERNEL__ */
 135 /*
 136  * User-space might still rely on the old definition:
 137  */
 138 struct sigcontext {
 139         unsigned short gs, __gsh;
 140         unsigned short fs, __fsh;
 141         unsigned short es, __esh;
 142         unsigned short ds, __dsh;
 143         unsigned long edi;
 144         unsigned long esi;
 145         unsigned long ebp;
 146         unsigned long esp;
 147         unsigned long ebx;
 148         unsigned long edx;
 149         unsigned long ecx;
 150         unsigned long eax;
 151         unsigned long trapno;
 152         unsigned long err;
 153         unsigned long eip;
 154         unsigned short cs, __csh;
 155         unsigned long eflags;
 156         unsigned long esp_at_signal;
 157         unsigned short ss, __ssh;
 158         struct _fpstate __user *fpstate;
 159         unsigned long oldmask;
 160         unsigned long cr2;
 161 };
 162 #endif /* !__KERNEL__ */
 163
 164 #else /* __i386__ */
 165
 166 /* FXSAVE frame */
 167 /* Note: reserved1/2 may someday contain valuable data. Always save/restore
 168    them when you change signal frames. */
 169 struct _fpstate {
 170         __u16   cwd;
 171         __u16   swd;
 172         __u16   twd;            /* Note this is not the same as the
 173                                    32bit/x87/FSAVE twd */
 174         __u16   fop;
 175         __u64   rip;
 176         __u64   rdp;
 177         __u32   mxcsr;
 178         __u32   mxcsr_mask;
 179         __u32   st_space[32];   /* 8*16 bytes for each FP-reg */
 180         __u32   xmm_space[64];  /* 16*16 bytes for each XMM-reg  */
 181         __u32   reserved2[12];
 182         union {
 183                 __u32   reserved3[12];
 184                 struct _fpx_sw_bytes sw_reserved; /* represents the extended
 185                                                    * state information */
 186         };
 187 };
 188
 189 #ifdef __KERNEL__
 190 struct sigcontext {
 191         unsigned long r8;
 192         unsigned long r9;
 193         unsigned long r10;
 194         unsigned long r11;
 195         unsigned long r12;
 196         unsigned long r13;
 197         unsigned long r14;
 198         unsigned long r15;
 199         unsigned long di;
 200         unsigned long si;
 201         unsigned long bp;
 202         unsigned long bx;
 203         unsigned long dx;
 204         unsigned long ax;
 205         unsigned long cx;
 206         unsigned long sp;
 207         unsigned long ip;
 208         unsigned long flags;
 209         unsigned short cs;
 210         unsigned short gs;
 211         unsigned short fs;
 212         unsigned short __pad0;
 213         unsigned long err;
 214         unsigned long trapno;
 215         unsigned long oldmask;
 216         unsigned long cr2;
 217
 218         /*
 219          * fpstate is really (struct _fpstate *) or (struct _xstate *)
 220          * depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
 221          * bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
 222          * of extended memory layout. See comments at the definition of
 223          * (struct _fpx_sw_bytes)
 224          */
 225         void __user *fpstate;           /* zero when no FPU/extended context */
 226         unsigned long reserved1[8];
 227 };
 228 #else /* __KERNEL__ */
 229 /*
 230  * User-space might still rely on the old definition:
 231  */
 232 struct sigcontext {
 233         unsigned long r8;
 234         unsigned long r9;
 235         unsigned long r10;
 236         unsigned long r11;
 237         unsigned long r12;
 238         unsigned long r13;
 239         unsigned long r14;
 240         unsigned long r15;
 241         unsigned long rdi;
 242         unsigned long rsi;
 243         unsigned long rbp;
 244         unsigned long rbx;
 245         unsigned long rdx;
 246         unsigned long rax;
 247         unsigned long rcx;
 248         unsigned long rsp;
 249         unsigned long rip;
 250         unsigned long eflags;           /* RFLAGS */
 251         unsigned short cs;
 252         unsigned short gs;
 253         unsigned short fs;
 254         unsigned short __pad0;
 255         unsigned long err;
 256         unsigned long trapno;
 257         unsigned long oldmask;
 258         unsigned long cr2;
 259         struct _fpstate __user *fpstate;        /* zero when no FPU context */
 260         unsigned long reserved1[8];
 261 };
 262 #endif /* !__KERNEL__ */
 263
 264 #endif /* !__i386__ */
 265
 266 struct _xsave_hdr {
 267         __u64 xstate_bv;
 268         __u64 reserved1[2];
 269         __u64 reserved2[5];
 270 };
 271
 272 struct _ymmh_state {
 273         /* 16 * 16 bytes for each YMMH-reg */
 274         __u32 ymmh_space[64];
 275 };
 276
 277 /*
 278  * Extended state pointed by the fpstate pointer in the sigcontext.
 279  * In addition to the fpstate, information encoded in the xstate_hdr
 280  * indicates the presence of other extended state information
 281  * supported by the processor and OS.
 282  */
 283 struct _xstate {
 284         struct _fpstate fpstate;
 285         struct _xsave_hdr xstate_hdr;
 286         struct _ymmh_state ymmh;
 287         /* new processor state extensions go here */
 288 };
 289
 290 #endif /* _ASM_X86_SIGCONTEXT_H */